Aminobicycloheptene/carboxylates and aminotricycloheptane carboxylates



Etiddfl'ffi AMINUEICYCLUHEPfENE/QAREQXYLATES AND AMHNOTRKCYCLQHEPTANE CARBOXYLATES Lee A. Miller, Dayton, (thin, assignor to Monsanto atent d by heating at a temperature of from, say, 50 C. to 125 C. Operation at the refluxing temperature of the reaction mixture is conveniently employed when a diluent or solvent is used. inert liquids which are useful as the shemical Company st Louis, Me a mrpomtion of 5 reaction media are the liquid hydrocarbons generally, Delaware halogenated hydrocarbons, ethers, or the lower fatty No Drawing. Filed Oct. 7, 1960, Ser. No. 61,068 acids, e.g., benzene, toluene, xylene, hexane, petroleum 14 Claims. (G. 260-463) spirits, dichlorobenzene, ethylene dichloride, carbon tetrachloride, tetrachlorobenzene, dioxane, glacial acetic acid, This invention relates to alicyclic amino esters and to 10 isopmpyl ether em Generally any Organic material of preparing Samewhich is non-reactive with either the reactants or the f g g 3? i i zi gg f products may be used. Since the reaction occurs by new f? ammo'sms w e f addition of one mole of the amine to one mole of the carboxylates and tncycloheptanecarboxylates by the addidi d th ta t d t P a 1, tion reaction of a primary or secondary amine with an 15 f l i vanlgglms y a kyl 2,S-norbornadiene-Z-carboxylate. The addition reamp 03 ed m Suc f lomemc plopoltlo'ns owever action proceeds with formation of a mixture of the an excass of ths dlemc compongntmay norbornene compound (I) and of the isomeric tricycloh ugh I do not knowthe exact mechanism underheptane compound 11 thus; lying the formation of the mlxture of alkyl 2-(nydrocarbyl g 1g /H C 9" 7 ac/ ccoor CO I f 2 I --9 it 2 '/R 4 m H no Q-N R H n C C H i V H H a C nc cn W (11)- R\ c coor N*- C t/ C \H in which R is a hydrocarbyl radical which is free of olefinic and acetylenic unsaturation and contains from 1 to 8 carbon atoms, R is selected from the class consisting of R and hydrogen, and Y is an alkyl radical of from 4 1 to 5 carbon atoms.

The alkyl Z-S-nOrbOrnadiene-Z-carboxylates are obtainable in known manner by reaction of cyclopentadiene with an alkyl propiolate. The presently useful carboxylates include the methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, isopentyl and tert-pentyl 2,S-norbornadiene-Z-carboxylates.

The presently useful amines are primarily hydrocarbylamines such as methyl-, ethyl-, propyl-, isopropyl-, butyl-, tert-butyl-, pentyl-, tert-pentyl-, hexyl-, heptyl-, octyl-, 2-ethylhexyl, benzy1-, 4-ethylbenzyl or Z-phenylethylamine, aniline, o-, mor p-toluidine, 2,3-, 2,4-, 2,5-, 2,6-, 3,4- or 3,5-xylidine, 0-, mor p-ethylaniline, cyclopentylamine, cyclopropylamine, cyclohexylamine or Z-methylcyclopentylamine; and the secondary, dihydrocarbylamines such as dimethyl-, diethy1-, diisopropyl-, dipropyl-, dibutyl-, di-tert-butyl-, dipentyl-, dihexyL, diheptyl', bis(2-ethylhexyl)-, dioctyl-, ethylmethyl-, butylpropyl-, dibenzyl-, bis(2-phenylethy1)-, diphenyl-, di-ptolyl-, bis(2-ethylphenyl)-, phenylpropyl-, dicyciopentyl-, dicyclohexyl-, butylcyclohexylor bis(4-methylbenzyl)- amine.

Reaction of the aikyl 2,5-norbornadiene-2-carboxylates with the primary or secondary amine to give the mixture of the isomeric alkyl 3-(hydrocarby1 or dihydrocarbyl amino)-5-norbornene-2-carboxylate (I) and alkyl 5-(hydrocarbyl or dihydrocarbyl amino) tricyclo[2.2.1.0 ]heptane-3-carboxylate (ii) takes place readily by simply contacting the,norbornadiene-carboxylate with the amine at ordinary or increased temperatures and in the presence or absence of an inert diluent or solvent. Advantageously, when a diluent is used, reaction is effected or hydrocarbyi amino)-5-norbornene-Z-carboxylate (I) and the alkyl Z-(hydrocarbyl or dihydrocarbyl amino)- 0 tricyclo[2.2.1.0 ]heptane-3-carboxylate (II), it is believed that addition of the primary or secondary amine to the dienic compound takes place at the 2,3-olefinic bond in one instance and by conjugate addition in the second instance. The mixture of (I) and (II) which is obtained may be used directly for some purposes, e.g., as a vulcanization accelerator for natural and synthetic rubbers. However, (I) and (II) are readily separated from each other by easy fractional distillation because the boiling points thereof are sufficiently far apart to permit it.

Examples of the presently provided compounds and of the amine and alkyl 2,5-norbornadiene-Z-carboxylate from which they are obtained according to this invention are shown below, wherein the 2,5-norbornadiene nucleus of the starting dienic carboxylate is denoted as D, the S-norbornene nucleus of the olefinic product (I) is denoted as X and the tricycle [2.2.l.0 ]heptane nucleus of the saturated product is denoted as Z:

Propyl 3-dimethylamino-X-2-carboxylate and propyl S-dimethylamino-Z-3-carboxylate from dimethylamine and propyl D-Z-carboxylate.

Butyl 3-phenylamino-X-Z-carboxylate and butyl S-phenylamino-Z-3-carboxylate from aniline and butyl D-2- carboxylate.

Ethyl 3-cyclohexylamino-X-2-carboxylate and ethyl 5-cyclohexylamino-Z-3-carboxylate from cyclohexylarnine and ethyl D-Z-carboxylate.

Methyl 3-benzylamino-X-Z-carboxylate and methyl 5-benzylamino-Z-3-carboxylate from benzylamine and methyl D-Z-carboxylate.

Pentyl 3-di-p-tolylamino-Y-lcarboxylate and pentyl 5-di-p-tolylamino-Z-3-carboxylate from di-p-tolylamine and pentyl D-Z-carboxylate.

Isopropyl 3-ethylmethylamino-X-2-carboxylate and isopropyl -ethylmethylamino-Z-3-carboxylate from ethylmethylamine and isopropyl D-Z-carboxylate.

Tert-butyl 3-diphenylamino-X-2-carboxylate and tertbutyl 5-diphenylamino-Z-3-carboxylate from diphenylamine and tert-butyl D-Z-carboxylate.

Methyl 3-(4-ethylphenyl)amino-X-Z-carboxylate and methyl 5-(4-ethylphenyl)amino-Z-3-carboxylate from 4-ethylaniline and methyl D-2-carboxylate.

Tert pentyl 3-cyclohexylpropylamino-X-2-carboxylate and tert-pentyl 5-cyclohexylpropylamino-Z-3-carboxylate from cyclohexylpropylamine and tert-pentyl D-2-carboxylate.

Methyl 3-diisopropylamino-X-2-carboxylate and methyl 5-diisopropylamino-Z-3-carboxy1ate from diisopropylamine and methyl D-2-carboxylate.

Ethyl 3[bis(2-ethylhexyl)amino]-X-2-carboxylate and ethyl 5-[bis(2-ethylhexyl)amino]-Z-3-carboxylate from bis(2-ethylhexyl)amine and ethyl D-Z-carboxylate.

Methyl 3-dibenzylamino-X-2-carboxylate and methyl- 5-dibenzylamino-Z-3-carboxylate from dibenzylamine and methyl D-2-carboxylate.

Pentyl 3-cyclopropylamino-X-Z-carboxylate and pentyl 5-cyclopropylamino-Z-3-carboxylate from cyclopropylamine and pentyl D-Z-carboxylate.

Isobutyl 3-dioctylamino-X-Z-carboxylate and isobutyl 5-dioctylamino-Z-3-carboxylate from dioctylamine and isobutyl D-2-carboxylate.

The presently provided alkyl 3-hydrocarbylamino or 3-dihydrocarbylamino S-norbornene-Z-carboxylates (I) and the alkyl S-hydrocarbylamino or S-dihydrocarbylamino tricyclo [2.2.1.0 heptane 3 carboxylates (II) are stable compounds which range from viscous liquids to waxy or crystalline solids which are advantageously employed for a variety of industrial and agricultural purposes. Both the bicycle olefinic compounds (I) and the tricyclo compounds (11) find use as vulcanization accelerators for rubber and both possess plant growth regulant effect. The olefinic compounds (I) are readily polymerizable and are especially useful in the preparation of synethetic, resinous copolymers with vinyl compounds such as styrene, methyl methacrylate, vinyl acetate, etc.

The invention is further illustrated by, but not limited to, thef ollowing examples:

Example 1 To a mixture consisting of 18.8 g. (0.125 mole) of methyl 2,5-norbornadiene-Z-carboxylate and 50 ml. of

benzene there was added dropwise 9.1 g. (0.125 mole) of diethylamine in 50 ml. of benzene. The whole was then refluxed for 12 hours. After distilling the benzene from the resulting reaction mixture, the residual mixture of adducts was fractionated to give 12.42 g. of a mixture of (A) methyl 3-diethylamino-5-norbornene-2-carboxylate and (B) methyl S-diethylaminotricyclo[2.2.1.0 heptane-3-carboxylate, B.P. 96-98 C./0.3 mm., n 1.4824 and analyzing as follows:

C OOCH l Example 2 H c .I-l PIG/$640081 in which R is hydrocarbon which is free of olefinic and acetylenic unsaturation and contains from 1 to 8 carbon atoms, R is selected from the class consisting of R and hydrogen, and Y is alkyl of from 1 to 5 carbon atoms, and a tricycloheptanecarboxylate of the formula wherein R, R and Y are as defined above.

2. Alkyl 3-hydrocarbonamino-5-norbornene-2-carbo yl. ate wherein alkyl has form 1 to S'carbon atoms and hydrocarbon is free of olefinic and acetylenic unsaturation and contains from 1 to 8 carbon atoms.

3. Alkyl 3-dihydrocarbonamino-5-norbornene-2-carboxylate wherein alkyl has from 1 to 5 carbon atoms and each hydrocarbon is free of olefinic and acetylenic unsaturation and contains from 1 to 8 carbon atoms.

4. Alkyl 5 -hydrocarbonaminotricyclo[2.2.1.0 ]-heptane-B-carboxylate wherein alkyl has from 1 to 5 carbon atoms and hydrocarbon has from 1 to 8 carbon atoms and is free of olefinic and acetylenic unsaturation.

5. Alkyl 5-dihydrocarbonaminotricyclo[2.2.1.0 ]-heptane-3-carboxylate wherein alkyl has from 1 to 5 carbon atoms and each hydrocarbon has from 1 to 8 carbon atoms and is free of olefinic and acetylenic unsaturation.

6. The method which comprises refluxing, in the presence of an inert diluent, methyl 2,5-norbornadiene-2- carboxylate with diethylamine and recovering methyl 3- diethylamino-5-norbornene-2-carboxylate from the resulting reaction product.

7. The method which comprises refluxing, in the presence of an inert diluent, methyl 2,5-norbornadiene-2- carboxylate with diethylamine and recovering methyl 5} diethylaminotricyclo[2.2.1.0 ]heptane 3 carboxylate from the resulting reaction product.

8. The method which comprises refluxing, in the presence of an inert diluent, aniline with methyl 2,5-nor- Ibornadiene-Z-carboxylate and recovering methyl S-phenylaminotricyclo[2.2.1.0 ]heptane-3-carboxylate from the resulting reaction product.

9. The method which comprises refluxing, in the presence of an inert diluent, aniline with methyl 2,5-norbornadiene-Z-carboxylate and recovering methyl 3-phenylamino-S-norbornene-Z-carboxylate from the resulting reaction product.

10. The method which comprises refluxing, in the presence of an inert diluent, alkyl 2,5-norbornadiene-2- carboxylate in which alkyl has from 1 to 5 carbon atoms with an amino compound of the formula in which R is hydrocarbon which is free of olefinic and acetylenic unsaturation and contains from 1 to 8 carbon atoms and R is selected from the class consisting of R and hydrogen, and recovering from the resulting reaction product an alicyclic amino ester selected from the class consisting of norbornene compounds of the formula C-COOY HQC l i R in which R and R are as defined above and Y is alkyl of from 1 to 5 carbon atoms.

11. The method which comprises refluxing, in the presence of an inert diluent, alkyl 2,5-norbornadiene-2 carboxylate having from 1 to 5 carbon atoms in alkyl with a hydrocarbonamine wherein hydrocarbon is free of olefinic and acetylenic unsaturation and contains from 1 to 8 carbon atoms to obtain a mixture of alkyl 3-hydro caroonamino-5-norbornene-Z-carboxylate and alkyl 5-hydrocarbonaminotricyclo[2.2.1.0 heptane 3 carboxylate wherein alkyl and hydrocarbon are as defined above.

12. The method which comprises refluxing, in the presence of an inert diluent, alkyl 2,5-norbornadiene-2- carboxylate having from 1 to 5 carbon atoms in alkyl with a dihydrocarbonamine wherein each hydrocarbon is free of olefinic and acetylenic unsaturation and contains from 1 to 8 carbon atoms to obtain a mixture of alkyl 3-dihydrocarbonamino-5-norbornene-2 carboxylate and alkyl 5 dihydrocarbonaminotricyclo[2.2.1.0 ]heptane-3-carboxylate wherein alkyl and hydrocarbon are as defined above.

13. The method which comprises refluxing, in the presence of an inert diluent, methyl 2,5-norbornadiene- Z-carboxylate with diethylamine and recovering a mixture of methyl 3-diethylamino-5 -norbornene-2-carboxylate and methyl S-diethylaminotricyclo[2.2.1.O ]heptane-B-carboxylate from the resulting reaction product.

14. The method which comprises refluxing, in the presence of an inert diluent, methyl 2,5-norbornadiene- Z-carboxylate with aniline to obtain a mixture of methyl S-phenylaminotricyclo[2.2.1.O ]heptane 3 carboxylate and methyl 3-phenyl-amino-5-norbornene-Z-carboxylate.

Hackhs Chemical Dictionary, third ed. (Philadelphia, 1944), p. 714.

Fuson: Advanced Organic Chemistry, pages 471472, John Wiley and Sons, New York, 1950. 

1. AN ALICYCLIC AMINO ESTER SELECTED FROM THE CLASS CONSISTING OF 5-NORBORNENE-2-CARBOXYLATES OF THE FORMULA 